Granularity segregation prevention structure for aluminum oxide stock bin
By installing a feed pipe and a flap structure inside the alumina silo, the problem of particle size segregation was solved, the production process of the electrolytic cell was improved, and the anode effect and greenhouse gas emissions were reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-04-14
AI Technical Summary
Severe particle size segregation in the alumina silo affects the electrolytic cell production process, increasing the anode effect and greenhouse gas emissions.
A guide pipe and a flap structure are installed inside the silo. The outer wall of the guide pipe has openings, and the flap can be rotatably installed at the openings. Combined with the design of baffles and hinges, the state of the openings is automatically adjusted by the gravity of alumina to reduce particle segregation.
It effectively reduces the flying of alumina in the silo, reduces particle segregation, reduces the anode effect coefficient of the electrolytic cell, reduces the generation of perfluorinated carbon, and protects the atmospheric environment.
Smart Images
Figure CN224118307U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of alumina technology, specifically relating to an anti-particle segregation structure for alumina silos. Background Technology
[0002] Particle size segregation refers to the phenomenon in loose materials where coarse and fine particles separate and aggregate.
[0003] In the aluminum electrolysis process, the concentration of alumina in the electrolyte solution is extremely strictly controlled. Uniformly adding alumina to the electrolytic cell is a crucial process control measure. This is achieved by a cell control system that precisely controls the supply of alumina to the cell based on monitored process parameters such as resistance. However, due to alumina particle segregation in the silo, smaller alumina particles tend to accumulate far from the silo outlet. When alumina is discharged from the silo outlet, fine particles are discharged irregularly and in a collapsing manner. This means that during feeding, some areas of the electrolytic cell are supplied with concentrated fine alumina particles, which float on the surface of the molten electrolyte and dissolve slowly. Since the cell control system determines the alumina concentration based on resistance, continuing to control the feeding before the appropriate concentration is reached can easily lead to precipitation and anodic effects.
[0004] Currently, no anti-particle segregation devices are designed and installed in the alumina silos of domestic electrolytic aluminum production. Alumina is lifted to the top of the silo via pneumatic conveying, bucket elevators, or other lifting equipment and directly injected into the silo, resulting in severe particle segregation and affecting the electrolytic cell production process. This not only increases the anode effect coefficient of aluminum electrolysis but also increases greenhouse gas emissions. Utility Model Content
[0005] The purpose of this invention is to provide an anti-particle segregation structure for alumina silos, so as to solve the problem of severe particle segregation affecting the electrolytic cell production process.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a structure for preventing particle segregation in alumina silos, comprising a silo body and a guide pipe, wherein the guide pipe is fixedly installed in the silo body, the outer wall of the guide pipe is provided with an opening, and a flap is provided on the guide pipe, the flap being rotatably installed at the port of the opening.
[0007] Preferably, the inner wall of the hopper is provided with a baffle, the baffle is inclined, and a hinge is provided between the flap and the guide pipe, with one end of the hinge being movably installed within the angle between the baffle and the hopper.
[0008] Preferably, an inlet is fixedly installed on the top wall of the feed pipe, the upper end of the inlet extends to the upper side of the hopper body, and an oscillator is provided between the inlet and the feed pipe.
[0009] Preferably, the feed tube is a hollow square, and there are several openings that are equidistantly distributed on the feed tube. The openings are located at least on the outer wall of one side of the feed tube.
[0010] Preferably, the oscillator is provided with springs, and the number of springs is four.
[0011] Preferably, the length of the guide pipe is not lower than the highest material level of the silo body.
[0012] The technical effects and advantages of this utility model are as follows: By combining the above-mentioned feed pipe and flap, the phenomenon of alumina flying in the silo can be reduced, the particle size segregation of alumina in the silo can be minimized, the anode effect coefficient of the electrolytic cell can be greatly reduced, and good feeding conditions can be provided for the "zero anode effect" production mode; and the amount of perfluorocarbon produced can be reduced, significantly reducing greenhouse gases, which is of great significance for atmospheric protection. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the installation of the feed tube of this utility model;
[0014] Figure 2 This is a schematic diagram of the front structure of the feed tube of this utility model;
[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the feed tube of this utility model;
[0016] Figure 4 This is an enlarged structural diagram of point A of this utility model.
[0017] In the diagram: 1. Hopper body; 2. Feed guide pipe; 3. Opening; 4. Flip plate; 5. Baffle; 6. Feed inlet; 7. Swinger; 8. Hinge. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] This utility model provides, for example Figure 1-4The diagram illustrates an anti-particle segregation structure for an alumina silo, comprising a silo body 1 and a feed pipe 2. The feed pipe 2 is fixedly installed inside the silo body 1. An opening 3 is provided on the outer wall of the feed pipe 2. A flap 4 is mounted on the feed pipe 2, rotatably installed at the opening. A baffle 5 is provided on the inner wall of the silo, inclined in arrangement. A hinge 8 is provided between the flap 4 and the feed pipe 2, with one end of the hinge 8 movably mounted within the angle between the baffle 5 and the silo. The feed pipe 2 is a hollow square, with several openings 3 evenly distributed on it, each opening 3 located at least on one side of the outer wall of the feed pipe 2. The length of the feed pipe 2 is not lower than the highest material level of the silo body 1.
[0020] The guide tube 2 is a square hollow tube with an open bottom that is not closed. At least one square outer wall has an opening 3. In actual use, multiple square outer wall openings 3 can be provided as needed. Each opening 3 has a flap 4 at its end, which can close the opening 3. The upper side of the flap 4 is connected to the guide tube 2 via a hinge 8. The flap 4 can be automatically closed by gravity. One end of the flap 4 is connected to the guide tube 2 via a hinge 8. A baffle 5 is provided on the inner wall of the guide tube 2 to limit the rotation angle of the flap 4. The baffle 5 and the guide tube form a 45-degree angle.
[0021] After alumina enters the feed pipe 2 through the inlet 6, the flaps 4 near the material level in the silo are first pushed open by the gravity of the alumina, allowing it to flow out of the feed pipe 2. Once the adjacent flaps 4 are completely buried by alumina, the accumulation of alumina will push open the previous flap 4. When the material level drops, the flaps 4 close again due to gravity as alumina flows out of the feed pipe 2, thus separating the feed pipe 2 from the silo. The total length of the feed pipe 2 is designed according to the height of the silo. Generally, the material level in the alumina silo fluctuates within a small range. The feed pipe 2 is mainly designed to meet the maximum material level and the maximum storage capacity of the silo. In this embodiment, the length of the feed pipe 2 is not lower than the maximum material level for ease of use.
[0022] Specifically, an inlet 6 is fixedly installed on the top wall of the feed pipe 2. The upper end of the inlet 6 extends to the upper side of the hopper body 1. An oscillator 7 is installed between the inlet 6 and the feed pipe 2. The oscillator 7 is equipped with four springs. The four springs limit the swing amplitude and direction, and also ensure timely resetting. The feed pipe 2 is affected by the flow of alumina within the hopper. As the alumina flows, it exerts a force on the feed pipe 2. This force can be released by the oscillator 7, reducing its adverse effects on the feed pipe 2.
[0023] In summary, the combination of the feed pipe 2 and the flap 4 can reduce the flying phenomenon of alumina in the silo, fundamentally solve the particle size segregation problem, minimize the particle size segregation of alumina in the silo, and significantly reduce the anode effect coefficient of the electrolytic cell, providing good feeding conditions for the "zero anode effect" production mode; and can also reduce the amount of perfluorocarbons produced, significantly reduce greenhouse gases, and have great significance for atmospheric protection.
[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A structure for preventing particle segregation in alumina silos, characterized in that: It includes a hopper body (1) and a guide pipe (2). The guide pipe (2) is fixedly installed inside the hopper body (1). The outer wall of the guide pipe (2) is provided with an opening (3). A flap (4) is provided on the guide pipe (2). The flap (4) is rotatably installed at the port of the opening (3).
2. The anti-particle segregation structure for alumina silos according to claim 1, characterized in that: The inner wall of the hopper is provided with a baffle (5), which is inclined. A hinge (8) is provided between the flap (4) and the guide pipe (2). One end of the hinge (8) is movably installed in the angle between the baffle (5) and the hopper.
3. The anti-particle segregation structure for alumina silos according to claim 1, characterized in that: The top wall of the feed pipe (2) is fixedly equipped with a feed inlet (6), the upper end of the feed inlet (6) extends to the upper side of the hopper body (1), and a swing device (7) is provided between the feed inlet (6) and the feed pipe (2).
4. The anti-particle segregation structure for alumina silos according to claim 1, characterized in that: The feed tube (2) is a hollow square, and there are several openings (3) that are evenly distributed on the feed tube (2). The openings (3) are located at least on the outer wall of one side of the feed tube (2).
5. The anti-particle segregation structure for alumina silos according to claim 3, characterized in that: The oscillator (7) is provided with springs, and the number of springs is four.
6. The anti-particle segregation structure for alumina silos according to claim 1, characterized in that: The length of the feed pipe (2) is not lower than the highest material level of the silo body (1).